The Council of Trent (Latin: Concilium Tridentinum) was an Ecumenical Council of the Roman Catholic Church. It is considered to be one of the Church's most important councils. It convened in Trento, Italty, between December 13, 1545, and December 4, 1563 in twenty-five sessions for three periods. Council fathers met for the first through eighth sessions in Trent (1545–7), and for the ninth through eleventh sessions in Bologna. Wikipedia